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Internet Services security features are layered and execute in this order:
1 Filter documents, which accepts or rejects mail based on the sender's IP address or domain name appearing in your filter(s) document.
2 Reverse DNS Lookup, which queries the DNS name against an incoming IP address for validity, if you have it enabled on your system.
3 RBL (Realtime Blackhole List) lookup, which queries up to three RBL services of your choice.
4 SMTP rules, which scans and inserts a message header, message body, and spam score (assigns a number) to incoming email based on its content.
5 User-created rules (described in our online help), which deal with incoming mail based on how the user has set them up.
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